New observations of the gills of Placopecten magellanicus (Mollusca: Bivalvia), and implications for nutrition

摘要: The internal anatomy and microanatomy of the gill Placopecten magellanicus Gmelin collected in May November 1985 from Chamcook Bay, New Brunswick, Canada, was studied using thin-section light microscopy transmission electron microscopy. Most spurs show no evidence organic union, hence do not participate vascular exchange. However, dorsal bend shows both ciliary interfilamentar union. structure hemocytes respiratory expansion are presented. epithelium consists three distinct cell types, bounded by apical microvilli. All regions contain an epithelial basal membrane, which is greatly convoluted interconnecting vessels expansion. significance these observations discussed relation to possible roles respiration, transmembrane transport nutrition. surface all ciliated cells covered with acellular matrix composed clear spherical vesicles, may serve a mechanical function for mucus would be unsuited. abundance mucocytes on abfrontal principal filaments terms escape response pectinid bivalves.